Fossil calls into question the purpose of the first feathers.

References
Lingham-Soliar T., et al. Proc. R. Soc. Lond. B, doi:10.1098/rspb.2007.0352 (2007).
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Sanderson, K. Bald dino casts doubt on feather theory. Nature (2007). https://doi.org/10.1038/news070521-6
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DOI: https://doi.org/10.1038/news070521-6